linkparser.java

来自「Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容」· Java 代码 · 共 82 行

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.extensions.markup.html.basic;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * This base implementation iterates over all provided <code>ILinkRenderStrategy</code>
 * implementations and applies them to the input text.
 * 
 * @author Gerolf Seitz
 */
public class LinkParser implements ILinkParser
{
	private final Map renderStrategies = new HashMap();

	/**
	 * Adds a render strategy to the parser.
	 * 
	 * @param pattern
	 *            the pattern to which the provided <code>renderStrategy</code> should be applied.
	 * @param renderStrategy
	 *            the <code>ILinkRenderStrategy</code> which is applied to the text found by the
	 *            provided <code>pattern</code>.
	 * @return this <code>ILinkParser</code>.
	 */
	public ILinkParser addLinkRenderStrategy(String pattern, ILinkRenderStrategy renderStrategy)
	{
		renderStrategies.put(pattern, renderStrategy);
		return this;
	}

	/**
	 * @see ILinkParser#parse(String)
	 */
	public String parse(String text)
	{
		if ((text == null) || ("".equals(text)))
		{
			return text;
		}

		String work = text;
		Iterator iter = renderStrategies.keySet().iterator();
		while (iter.hasNext())
		{
			String pattern = (String) iter.next();
			ILinkRenderStrategy strategy = (ILinkRenderStrategy)renderStrategies.get(pattern);

			Matcher matcher = Pattern.compile(pattern, Pattern.DOTALL).matcher(work);
			StringBuffer buffer = new StringBuffer();
			while (matcher.find())
			{
				String str = matcher.group();
				matcher.appendReplacement(buffer, strategy.buildLink(str));
			}
			matcher.appendTail(buffer);
			work = buffer.toString();
		}
		return work;
	}
}